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at the cursor position and moves all following charac-
ters left one position. At the end of the delete -func-
tion, an insert character is written into the last posi-
tion on the line. If Edit Page is set, the character in
column 1 of the next line moves back to column SO of
the previous line (as described above). The last posi-
tion on the page is loaded with an insert character. If
Protect mode is on, character delete operates only in
the Edit Line mode from the cursor position to the
end of the unprotected field or line.
• Set insert mode (ESC q) - Sets automatic character
insertion. This mode operates like Character Insert
(above), except that a typed alpha-numeric character
is automatically inserted
~
on the screen at the cursor
position. This causes all characters to the right of the
cursor to move one column to the right. If Edit Page
is set, the character in column SO moves to column 1
of the next line. The character at the end of the line or
at the end of the page is lost. INSL or INSP will be in-
dicated on the Status Line.
• Clear insert mode (ESC r)-Clears the Insert
mode. EDTL or EDTP will be indicated on the status
line.
• Line insert (ESC E) - With the Protect mode off,
inserts a line consisting of insert characters at the cur-
sor position. This causes the cursor to move to the
start of the new line and all following lines to move
down one line, resulting in the loss of the last line on
the page. If the Protect mode is on, a line insert com-
mand has no effect.
• Line delete (ESC R) - When the Protect mode is
off (has no effect when Protect mode is on), deletes
the line at the cursor position, and all following lines
move up one line. Also causes the cursor to move to
column 1 of the line and insert characters to load into
the last line of the page.
• Erase to end of line (ESC T) - Erases all unpro-
tected characters from the cursor to the end of the line
(or field, if in the Protect mode) and replaces them
with insert characters. If Half Intensity is on, H.I. in-
sert characters replace the erased characters.
• Erase to end of line with nulls (ESC t) - Erases all
characters from the cursor position to the end of the
line or the end of an unprotected field and replaces
them with null characters. If Half Intensity is on, the
erased characters are replaced with half-intensity null
characters.
• Erase to end of page (ESC Y) - Replaces unpro-
tected characters from the cursor position to the end
of the page with insert characters. If Half Intensity is
on, erased characters will be replaced with half -inten-
sity insert characters.
• Erase to end of page with nulls (ESC y) - Erases all
unprotected characters from the cursor position to
the end of the page and replaces them with null char-
acters. If Half Intensity is on, erased characters are
replaced with half-intensity null characters.
3.15.3 Protect Mode
The Model 950 features a Protect mode in which defined
screen/ page areas may be set to prevent data entries by
3-18
the system operator. This feature is particularly useful
for setting up forms on the screen for purchasing or ac-
counting or similar applications. When the terminal is in
the Protect mode, only unprotected fields may be ac-
cessed for data entry or change. The mode operates in
conjunction with Half Intensity; when the Protect mode
is enabled, all half-intensity, attribute and graphic char-
acters are protected characters. The control code se-
quences and a description of the Protect mode functions
follows:
• Protect mode on (ESC
&) -
Turns on the Protect
mode. Indicated on the status line by PROT. Causes
half-intensity, graphic, and attribute characters to be
protected from overwriting or erasure. PROT will be
indicated on the Status Line.
• Protect mode off (ESC ') - Turns off the Protect
mode. Indicated on the Status Line.by PROT being
replaced by spaces.
• Write Protect on (ESC» - Turns on the Write Pro-
tect mode (also called Half Intensity). Until the mode
is reset, each character entered is displayed at half in-
tensity. Indicated on the Status line by R.I.
• Write Protect off (ESC O-Turns off the Write
Protect mode (resets Write Protect). All characters
entered are displayed at full intensity. Indicated on
the status line by R.I. not being present.
3.15.4 Tab Programming
As briefly described in paragraph 3.S.3, the cursor may
be moved on the screen to preset typewriter-style tabs or
to field tabs if the Protect mode is set. The control code
sequences and a description of the tab operations follows:
• Set tab (ESC 1)- When the Model 950 is set to the
Protect mode, the code generates a vertical column of
half intensity spaces from the cursor position down to
the first write-protected character or to the end of the
page, whichever is first. When the Protect mode is
off, the code sets a typewriter-style column tab.
• Clear tab (ESC 2) - Clears the typewriter tab at the
cursor column. The code has no effect when the Pro-
tect mode is set.
• Clear all tabs (ESC 3) - Clears all the typewriter- '
style tabs set on a page. The code has no effect when
the Protect mode is set.
• Tab (protect and unprotect - CTRL I) - When the
Protect mode is off, the code causes the cursor to ad-
vance through the next typewriter-style tab set. If no
tabs are set, the code has no effect and the cursor will
not move. When the Protect mode is set, the cursor is
moved to the first unprotected character following
the next protected field.
If Auto Page is off and there are no following unpro-
tected fields, the cursor moves to the first character of
the first unprotected field at the top of the page. If
there are no characters on the page, the cursor will
move to Home position.
If Auto Page is on and no unprotected field follows,
the cursor will advance to the first unprotected char-
acter on the next page. If no unprotected field exists
on the next page, the cursor moves to Home position
on that page.
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